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The reason for small radius of Ga compar...

The reason for small radius of Ga compared to Al is ……..

A

poor screening effect of d and f-orbitals

B

increase in nuclear charge

C

presence of higher orbitals

D

higher atomic number

Text Solution

Verified by Experts

The correct Answer is:
A
On moving down the group from Al to Ga, atomic radius decrease (exception) due to poor shielding by d-electrons. On moving form Al to Ga, shielding effect n d-electrons is unable to compensate increased nuclear charge.
Hence, successive increase of atomic radius as expected is not observed.
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